Bouncer was a 1983 arcade game that seemed to have everything going for it - with unusually good graphics and animation for the time, it was getting rave reviews. But it was never released, and no ROM has turned up, making it something of a lost classic of that era.

The open-ended Star Trek-like game was very influential as an early PC game in 1986, but also received a Sega Genesis port, unusual considering its genre. It's easy to find online today; certainly the Genesis version is.